Washington was a farmer, yet he never in his life beheld a tomato, nor a cauliflower, nor an eggplant, nor a horserake, nor a drill, nor a reaper and binder, nor a threshing machine, nor a barbed wire fence.

Don't forget horse-drawn wagons and other conveyances and implements. Horses aren't the sketchy beasts some folks make them out to be. Nearly every horse can become a proficient draughtsman, or draft animal.